First generation HDMI products supported 165 MHz pixel
rates; which allowed 1080p 60 Hz vide with 8 or 12 bit/component color depth (RGB 4:4:4 and YUV 4:2:2 formats). Second
generation HDMI products supported 225 MHz equivalent
pixel rates, allowing for 1080p 60 Hz video with more than 8
bits/pixel for RGB. Third generation HDMI products support
300 MHz (equivalent), allowing for 4K 24/30 Hz video. The 4th
generation product defined new HDCP 2.2 encryption, which
the film studio industry requires to view 4K content. 5th generation products support HDMI 2.0b which include full 600
MHz 4K video and HDCP 2.2 on all inputs.
Built with the latest HDMI technology from Analog Devices or
Silicon Image (now part of Lattice), MDS OEM HDMI repeater
modules for AV applications offer a unique set of features for
audio use.
With MDS modules manufacturers can have solutions ready
for market with minimal development risk. Manufacturers can
focus on the user experience and “front panel” and “rear
panel” design and avoid the headaches of the high speed
design and the complex software for HDMI processing.
Product Details
The feature comparison following table summarizes the 4th
and 5th generation HDMI repeater products available from
MDS. A separate datasheet describes MDS’ 4th gen products.
All inputs feature adaptive cable EQ that supports (typical, for
good quality source and cable) 10m at the highest supported
data rate.
Off the shelf platforms for HDMI applications
The HDMI inputs and outputs support the mandatory video
features found in the HDMI 2.0 specification at equivalent frequencies up to 600 MHz, which include 4K 60 Hz as well as
HDR (10 bit). High quality Tyco HDMI connectors are used to
ensure reliable connector operation over the life of the product.
Audio extract/insert
All MDS HDMI repeater products extract the audio
(as four I2S lines along with a SPDIF line) for local
processing. The audio decoder can then provide a
downmixed stereo PCM signal for the HDMI transmitter.
Common design
The HSR-1Q, HSR-41Q and HSR-72Q are mechanically compatible with the 2nd and later generation
MDS HDMI products. The same connector signals
are used, though there are slightly different operational characteristics due to the HDMI parts used.
The software API for the three models are likewise
a superset of the earlier generation products. This
commonality in hardware and software allows
system designs to easily incorporate any MDS
HDMI repeater product.
HDMI switcher/repeater modules
HSR-41Q HDMI switcher/repeater
Flexible EDID control
An HDMI repeater device would not function well in the real
world if it simply assumed the two connected HDMI sink
devices support the same capability. For example, an HDMI
source might need to route to an audio system and a projector. The projector might only support stereo PCM audio.
If the repeater blindly took the lowest common format
among the connected sink devices, the audio system would
always be fed 2 channel PCM data by the source instead of
surround sound (compressed) data.
The cards can be set to assign input audio formats different
from the sink device(s) supported formats.
As with the HSR-82.2, the 2nd output on the HSR-72Q can
not pass 4K video. It is suggested that this port be used for
audio only to avoid customer confusion in a 4K product.
HDCP 2.2
All three models support HDCP 2.2 on all inputs to support
the latest 4K media devices.
mary output, the CEC specification does not support multioutput repeaters. The other specifications on the HSR-72Q
are the same as the HSR-41Q.
Developing with MDS HDMI modules
MDS offers an evaluation kit that provide everything needed
to evaluate the modules and start code development on
your host processor.
HDCP 2.2 introduces a large number of new restrictions on
viewing content and can lead to unexpected problems in
whole home or commercial installations with a mix of device
capabilities. MDS products automatically attempt to avoid as
many issues as possible, but can not correct for faulty
source devices.
Four input switcher single output repeater
MDS offers a four input, one output switcher/repeater modules, the HSR-41Q.
The HSR-41Q can loop audio from input to output; for AV
Receiver applications the general mode of operation is that
the decoder would be fed the (Dolby/DTS) encoded input
and supply a stereo (PCM) downmix for the sink device.
Mechanically the HSR-41Q can mount into the same set of
holes as the HSR-72Q, simplifying chassis designs when two
different configurations may be desired.
The HSR-41Q supports pass through of the mandatory 3D
formats defined in the HDMI 1.4 specification. The ARC feature is supported but requires a full CEC implementation of
the Audio System logical device as defined in the HDMI
specification.
The HSR-1Q is a narrower board than the HSR-41Q with just
one input connector, but otherwise is identical.
Seven input switcher repeater
Many AV applications require sending video to one location
and audio to another. The 72Q’s output can be used for this
purpose, or to create a second copy of video for non-4K
applications. CEC and ARC are only supported on the pri-
The kit include the module (mounted to a base), interconnect
cables, power supply, a (generic) host side API library, and a
microprocessor based demonstration program to simplify
experimentation.
Host connectors
A 26 pin IDC (.1”) connector carries primary 3.3V power, the
2
C control signals, and the audio signals received by the
I
card.
Note that the audio data may be invalid due to the source
creating bad data or things like cable disconnects. Users of
the audio data should check status to mute during recognized invalid data periods and be prepared to handle audio
clock discontinuities.
MDS Alpha messaging control protocol
All products uses the same I2C based messaging protocol
used on other MDS OEM products. Users of those products
will find the HDMI modules easy to control; users new to the
MDS alpha messaging protocol can start with supplied C++
based examples that can be recompiled to run on typical
embedded 32 bit microcontrollers.
Board integration
The boards require 3.3 and 5V power. In addition to the I2S
related signals, connection to I2C clock/data, and a (board to
host) interrupt line are needed. The board’s reset input
should only be released once the supplies are stable and the
host is ready to start interacting with the board. For full
details the relevant hardware manual should be consulted.
PRELIMINARY - SUBJECT TO CHANGE
5432 Bolsa Ave, Unit B, Huntington Beach, CA 92649, USA
Phone: +1 714-378-5805
http://www.mds.com
HDMI switcher/repeater modules
HDMI out
HDMI in
clocks & frame
syncs
clocks & frame
syncs
GPIO
GPIO
4 I2S & SPDIF
SPI
SPI
SPI
(1) I2S / SPDIF
Control
micro
status / control
I2C
INT*
READY*
I2C addr
Sel
I2C
H
I2C
34
to host
connectors
Output audio
from host
system
I2C
I
2
C
primary
secondary
HDMI 1.4 only (no 4K)
boot
flash
boot
flash
control and
audio to host
26
3.3V power
I2C
H
I2S
CPLD
CEC I/O
CEC
ARC
from
HDMI
out
SPDIF
to micro
SII9777
4 x 1
HDMI
switch
4 x 1:2
HDMI
switch
EDID
EQ
EQ
EQ
EQ
EDID
EQ
EQ
EQ
EQ
HSR-72Q Block Diagram
Audio subsystem differences from 4th generation boards
The Silicon Image (now Lattice) devices used in these
boards only offer a subset of the audio capabilities of the
ADI devices previously used. Key differences to note for customers using this as an upgrade are as follows.
The audio clock interruptions are different, the Lattice part
does not maintain valid clock. MDS has added a CPLD to
make the board act more like existing MDS HDMI products,
but existing systems should be thoroughly revaluated with
the new boards.
As noted in the summary table the Lattice HDMI parts do not
support DSD.
Only one I2S line (i.e. stereo) is available for audio output
with the Lattice part, versus 4 I2S in the prior generation
boards. As the output normally only carries a stereo mixdown this should not affect operation. Internally to the HDMI
chip all audio can be passed through for a bypass mode.
An audio DAC is connected to the primary I2S input line to
allow playback of 2 channel stereo PCM without need to
connect external devices. Likewise a SPDIF in and out allows
for easy experimentation before connecting into a more
complex system.
MDS HDMI testing of a final customer unit
MDS must be supplied with a final unit to run a range of
mandatory HDMI tests to ensure conformance with the
HDMI licensing rules. Customers with their own HDMI
license can do their own family product self certifications.
Two levels of testing are possible, a basic test for cases
where CEC is not being used, and a combined basic plus
CEC test for units that will use CEC (use of ARC requires
CEC). Typical test periods run from 1 to 3 days, unless problems are found, which is unlikely in the basic tests but possible in the CEC test as the host software must process and
respond to a range of possible CEC messages.
PRELIMINARY - SUBJECT TO CHANGE
5432 Bolsa Ave, Unit B, Huntington Beach, CA 92649, USA
Phone: +1 714-378-5805
http://www.mds.com
Evaluation kit
To gain experience with
integrating MDS HDMI
products into your system
design, MDS offers an evaluation kit that includes the
selected HDMI repeater
board and the adapter
board shown on the last
page.
Using this board and the
provided software the HSR
can be controlled and configured without the need to
have your own host application code running yet.
Pass through connectors
allow connecting to your
audio subsystem but still
use the MDS provided software for control and status
monitoring. Alternately the
EVM board can be setup for
loopback of received HDMI
audio to the output.
HDMI switcher/repeater modules
HSR-EVM
GPIO
CPLD
programming
4 I2S data
clocks &
frame syncs, mute,
TTL level SPDIF
DAC
Out
SPDIF
out
9-12V DC
+3.3
+5
10
SPDIF
in
4 I2S data
clocks &
frame syncs, mute,
TTL level SPDIF
power
supplies
CPLD
To HSR: processed audio
from host, Power, SPI
30 / 34 pins
26
30
interface
processor
LPC1758
I2C
USB
From HSR: received
HDMI audio, Power, I2C
26 pins
Status LEDS
Reset
To customers DAC eval
board
From customers ADC
eval board
26
30
I2C
I2C
Serial
Mode
Control
SPI
I2C
SPI
HSR test
port
CS0 - HSR
CS1 - CPLD
stereo
DAC
OFF
ON
12345 678910
Eval kit adapter board
Ordering information
Minimum order quantity of standard OEM boards is 50
pieces. Please contact MDS’ OEM sales manager for details.
HSR-72Q 7 input, HDMI switcher/repeater. One 600 MHz full
featured output.
• HDMI 1.4 & 2.0b mandatory formats
• Up to “4K” pixel rates at 24-60 Hz (4:4:4)
• 4K 4:2:0 format video at 60 Hz
• Up to 12 bit Deep Color and HDR
• All typical colorspaces supported
• Audio extraction/injection (I2S standard) and loop through
• CEC switch and Audio System device support
• ARC (primary output)
HSR-41Q: 4 input HDMI switcher/repeater.
• HDMI 1.4 & 2.0b mandatory formats
• Up to “4K” pixel rates at 24-60 Hz (4:4:4)
• 4K 4:2:0 format video at 60 Hz
• Up to 12 bit Deep Color and HDR
• All typical colorspaces supported
• Audio extraction/injection (I2S standard) and loop through
• CEC switch and Audio System device support
• ARC (primary output)
HSR-1Q: single input HDMI switcher/repeater.
• Same as 41Q except single input
The actual allowed input format is determined by the sink device(s) connected
to the unit, the above descriptions define the maximum available capability.
Video using Dolby’s proprietary HDR video format is passed by the board as
that format is designed to be backwards compatible. To license Dolby’s video
products please contact Dolby for more information.
Related products
#-EVM-KIT: Add this suffix to the above for the developer/eval
kit
• Selected board
• IDC cables
2
• Eval adapter board with USB port to I
C feature to allow control from a
PC ‘terminal’
• Control API documentation
• Example code
• Connector, power, and mechanical information
• Power supply (110/220 universal input brick)
HTEST-BASIC: HDMI product family self certification test
HTEST-CEC: For HDMI product using CEC (or ARC), verifica-
tion of proper CEC handling
Licensing
These products use licensed technologies and are only available for sale to authorized audio / video companies. Please
contact MDS for more information.
Trademarks:
Dolby is trademark of Dolby Laboratories, Inc., DTS is a
trademark of Digital Theater Systems, Inc. HDMI, the
HDMI logo and High-Definition Multimedia Interface are
trademarks or registered trademarks of HDMI Licensing
LLC.HDCP is a trademark of Digital Content Protection,
LLC.x.v.Color is a trademark of Sony. DAE and DAE-8 are
trademarks of MDS.
PRELIMINARY - SUBJECT TO CHANGE
HSR 5th gen datasheet rev 2b Jul 17
5432 Bolsa Ave, Unit B, Huntington Beach, CA 92649, USA
Phone: +1 714-378-5805
http://www.mds.com
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